Yarus, Roar of the Old Gods
Karlov Watchdog
Phyrexian Altar
Harmless Offering

   Prerequisites

What do I need to start this combo?
Harmless Offering in hand.
All other permanents on the battlefield.
You control a face-down creature whose front face is a permanent card. You have enough mana to cast Harmless Offering.

   Steps

How does this combo work?
1
Cast Harmless Offering by paying its mana cost, giving control of Karlov Watchdog to an opponent.
2
During the opponent's turn, activate Phyrexian Altar by sacrificing a face-down creature you control, adding one mana of any color.
3
When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
4
Repeat from step 2.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite colored mana
Infinite sacrifice triggers
Infinite death triggers
Kaust, Eyes of the Glade
0.1%inclusion2 decks2.90K decks
Rocco, Cabaretti Caterer
0.0%inclusion1 decks9.16K decks
Creatures
Ainok Survivalist
100%inclusion3 decks3 decks
99%synergy
Ashcloud Phoenix
100%inclusion3 decks3 decks
99%synergy
Den Protector
100%inclusion3 decks3 decks
99%synergy
Essence of Antiquity
100%inclusion3 decks3 decks
100%synergy
Experiment Twelve
100%inclusion3 decks3 decks
99%synergy
Hidden Dragonslayer
100%inclusion3 decks3 decks
99%synergy
Bazaar Trader
67%inclusion2 decks3 decks
67%synergy
Curator Beastie
67%inclusion2 decks3 decks
66%synergy
Deathmist Raptor
67%inclusion2 decks3 decks
66%synergy
Hauntwoods Shrieker
67%inclusion2 decks3 decks
66%synergy
Nantuko Vigilante
67%inclusion2 decks3 decks
66%synergy
Printlifter Ooze
67%inclusion2 decks3 decks
66%synergy
Salt Road Ambushers
67%inclusion2 decks3 decks
66%synergy
Thelonite Hermit
67%inclusion2 decks3 decks
66%synergy
Unyielding Gatekeeper
67%inclusion2 decks3 decks
66%synergy
Whisperwood Elemental
67%inclusion2 decks3 decks
66%synergy
Beast Whisperer
67%inclusion2 decks3 decks
57%synergy
Boltbender
67%inclusion2 decks3 decks
66%synergy
Duskana, the Rage Mother
67%inclusion2 decks3 decks
66%synergy
Proteus Machine
67%inclusion2 decks3 decks
67%synergy
Pyrotechnic Performer
67%inclusion2 decks3 decks
66%synergy
Root Elemental
67%inclusion2 decks3 decks
66%synergy
Seedborn Muse
67%inclusion2 decks3 decks
59%synergy
Yedora, Grave Gardener
67%inclusion2 decks3 decks
66%synergy
Agate Instigator
33%inclusion1 decks3 decks
29%synergy
Aurelia's Vindicator
33%inclusion1 decks3 decks
33%synergy
Frontline Strategist
33%inclusion1 decks3 decks
33%synergy
General Kreat, the Boltbringer
33%inclusion1 decks3 decks
33%synergy
Molten Gatekeeper
33%inclusion1 decks3 decks
31%synergy
Purphoros, God of the Forge
33%inclusion1 decks3 decks
28%synergy
Riftsweeper
33%inclusion1 decks3 decks
33%synergy
Shocking Sharpshooter
33%inclusion1 decks3 decks
33%synergy
Stiltzkin, Moogle Merchant
33%inclusion1 decks3 decks
33%synergy
Terror of the Peaks
33%inclusion1 decks3 decks
30%synergy
Tin Street Gossip
33%inclusion1 decks3 decks
33%synergy
Weftstalker Ardent
33%inclusion1 decks3 decks
31%synergy
Witty Roastmaster
33%inclusion1 decks3 decks
31%synergy
Craterhoof Behemoth
33%inclusion1 decks3 decks
27%synergy
Eternal Witness
33%inclusion1 decks3 decks
27%synergy
Fortune Thief
33%inclusion1 decks3 decks
33%synergy
Krosan Cloudscraper
33%inclusion1 decks3 decks
33%synergy
Nervous Gardener
33%inclusion1 decks3 decks
33%synergy
Pinnacle Monk
33%inclusion1 decks3 decks
32%synergy
Watcher of the Roost
33%inclusion1 decks3 decks
33%synergy
Akroma, Angel of Fury
33%inclusion1 decks3 decks
33%synergy
Hooded Hydra
33%inclusion1 decks3 decks
33%synergy
Jasmine Boreal of the Seven
33%inclusion1 decks3 decks
33%synergy
Master of Pearls
33%inclusion1 decks3 decks
33%synergy
Neheb, the Eternal
33%inclusion1 decks3 decks
33%synergy
Ohran Frostfang
33%inclusion1 decks3 decks
26%synergy
Instants
Break Down the Door
67%inclusion2 decks3 decks
66%synergy
Heroic Intervention
67%inclusion2 decks3 decks
27%synergy
Path to Exile
67%inclusion2 decks3 decks
13%synergy
Congregation at Dawn
33%inclusion1 decks3 decks
31%synergy
Pull from Eternity
33%inclusion1 decks3 decks
33%synergy
Boros Charm
33%inclusion1 decks3 decks
9%synergy
Eladamri's Call
33%inclusion1 decks3 decks
24%synergy
Flawless Maneuver
33%inclusion1 decks3 decks
19%synergy
Beast Within
33%inclusion1 decks3 decks
3%synergy
Chaos Warp
33%inclusion1 decks3 decks
14%synergy
Return of the Wildspeaker
33%inclusion1 decks3 decks
17%synergy
Swords to Plowshares
33%inclusion1 decks3 decks
-24%synergy
Teferi's Protection
33%inclusion1 decks3 decks
17%synergy
Sorceries
Cultivate
67%inclusion2 decks3 decks
18%synergy
Hide in Plain Sight
67%inclusion2 decks3 decks
66%synergy
Jeska's Will
67%inclusion2 decks3 decks
61%synergy
Kodama's Reach
33%inclusion1 decks3 decks
7%synergy
Nature's Lore
33%inclusion1 decks3 decks
-5%synergy
Nissa's Pilgrimage
33%inclusion1 decks3 decks
33%synergy
Skyshroud Claim
33%inclusion1 decks3 decks
25%synergy
Three Visits
33%inclusion1 decks3 decks
6%synergy
Austere Command
33%inclusion1 decks3 decks
19%synergy
Bala Ged Recovery
33%inclusion1 decks3 decks
28%synergy
Crackle with Power
33%inclusion1 decks3 decks
33%synergy
Endless Swarm
33%inclusion1 decks3 decks
33%synergy
Gamble
33%inclusion1 decks3 decks
30%synergy
Regrowth
33%inclusion1 decks3 decks
32%synergy
Under the Skin
33%inclusion1 decks3 decks
33%synergy
Fell the Mighty
33%inclusion1 decks3 decks
32%synergy
Valgavoth's Onslaught
33%inclusion1 decks3 decks
33%synergy
Utility Artifacts
Altar of Dementia
100%inclusion3 decks3 decks
99%synergy
Ashnod's Altar
100%inclusion3 decks3 decks
95%synergy
Dream Chisel
100%inclusion3 decks3 decks
100%synergy
Scroll of Fate
67%inclusion2 decks3 decks
66%synergy
Altar of the Brood
33%inclusion1 decks3 decks
33%synergy
Assault Suit
33%inclusion1 decks3 decks
33%synergy
Blasting Station
33%inclusion1 decks3 decks
32%synergy
Grafted Wargear
33%inclusion1 decks3 decks
33%synergy
Spawning Pit
33%inclusion1 decks3 decks
33%synergy
Cloud Key
33%inclusion1 decks3 decks
33%synergy
Forsaken Monument
33%inclusion1 decks3 decks
33%synergy
Lightning Greaves
33%inclusion1 decks3 decks
7%synergy
Swiftfoot Boots
33%inclusion1 decks3 decks
6%synergy
Dissection Tools
33%inclusion1 decks3 decks
33%synergy
Lifecrafter's Bestiary
33%inclusion1 decks3 decks
29%synergy
Panoptic Projektor
33%inclusion1 decks3 decks
33%synergy
Enchantments
Goblin Bombardment
100%inclusion3 decks3 decks
94%synergy
Obscuring Aether
100%inclusion3 decks3 decks
99%synergy
Threats Around Every Corner
100%inclusion3 decks3 decks
100%synergy
Trail of Mystery
100%inclusion3 decks3 decks
99%synergy
Veiled Ascension
100%inclusion3 decks3 decks
99%synergy
Mastery of the Unseen
67%inclusion2 decks3 decks
66%synergy
Rhythm of the Wild
67%inclusion2 decks3 decks
38%synergy
True Identity
67%inclusion2 decks3 decks
66%synergy
Defense of the Heart
33%inclusion1 decks3 decks
30%synergy
Experimental Lab // Staff Room
33%inclusion1 decks3 decks
33%synergy
Fanatical Devotion
33%inclusion1 decks3 decks
32%synergy
Impact Tremors
33%inclusion1 decks3 decks
19%synergy
Warleader's Call
33%inclusion1 decks3 decks
25%synergy
Mirari's Wake
33%inclusion1 decks3 decks
24%synergy
Wilderness Reclamation
33%inclusion1 decks3 decks
31%synergy
Ugin's Mastery
33%inclusion1 decks3 decks
33%synergy
Planeswalkers
Ugin, the Ineffable
67%inclusion2 decks3 decks
66%synergy
Vivien, Champion of the Wilds
33%inclusion1 decks3 decks
32%synergy
Artifacts
Altar of Dementia
100%inclusion3 decks3 decks
99%synergy
Ashnod's Altar
100%inclusion3 decks3 decks
95%synergy
Dream Chisel
100%inclusion3 decks3 decks
100%synergy
Scroll of Fate
67%inclusion2 decks3 decks
66%synergy
Sol Ring
67%inclusion2 decks3 decks
-17%synergy
Altar of the Brood
33%inclusion1 decks3 decks
33%synergy
Assault Suit
33%inclusion1 decks3 decks
33%synergy
Blasting Station
33%inclusion1 decks3 decks
32%synergy
Grafted Wargear
33%inclusion1 decks3 decks
33%synergy
Spawning Pit
33%inclusion1 decks3 decks
33%synergy
Chromatic Lantern
33%inclusion1 decks3 decks
21%synergy
Chromatic Orrery
33%inclusion1 decks3 decks
33%synergy
Cloud Key
33%inclusion1 decks3 decks
33%synergy
Forsaken Monument
33%inclusion1 decks3 decks
33%synergy
Lightning Greaves
33%inclusion1 decks3 decks
7%synergy
Swiftfoot Boots
33%inclusion1 decks3 decks
6%synergy
Thought Vessel
33%inclusion1 decks3 decks
28%synergy
Arcane Signet
33%inclusion1 decks3 decks
-41%synergy
Dissection Tools
33%inclusion1 decks3 decks
33%synergy
Lifecrafter's Bestiary
33%inclusion1 decks3 decks
29%synergy
Panoptic Projektor
33%inclusion1 decks3 decks
33%synergy
Utility Lands
Branch of Vitu-Ghazi
100%inclusion3 decks3 decks
99%synergy
Zoetic Cavern
67%inclusion2 decks3 decks
66%synergy
Reliquary Tower
33%inclusion1 decks3 decks
15%synergy
Temple of the False God
33%inclusion1 decks3 decks
23%synergy
Tomb of the Spirit Dragon
33%inclusion1 decks3 decks
33%synergy
Mana Artifacts
Sol Ring
67%inclusion2 decks3 decks
-17%synergy
Chromatic Lantern
33%inclusion1 decks3 decks
21%synergy
Chromatic Orrery
33%inclusion1 decks3 decks
33%synergy
Thought Vessel
33%inclusion1 decks3 decks
28%synergy
Arcane Signet
33%inclusion1 decks3 decks
-41%synergy
Lands
Arid Mesa
100%inclusion3 decks3 decks
73%synergy
Windswept Heath
100%inclusion3 decks3 decks
68%synergy
Wooded Foothills
100%inclusion3 decks3 decks
70%synergy
Canopy Vista
67%inclusion2 decks3 decks
17%synergy
Cinder Glade
67%inclusion2 decks3 decks
17%synergy
Commercial District
67%inclusion2 decks3 decks
58%synergy
Elegant Parlor
67%inclusion2 decks3 decks
60%synergy
Lush Portico
67%inclusion2 decks3 decks
58%synergy
Plateau
67%inclusion2 decks3 decks
56%synergy
Sacred Foundry
67%inclusion2 decks3 decks
26%synergy
Taiga
67%inclusion2 decks3 decks
56%synergy
Command Tower
67%inclusion2 decks3 decks
-24%synergy
Exotic Orchard
67%inclusion2 decks3 decks
13%synergy
Jungle Shrine
67%inclusion2 decks3 decks
12%synergy
Bloodstained Mire
33%inclusion1 decks3 decks
28%synergy
Flooded Strand
33%inclusion1 decks3 decks
28%synergy
Jetmir's Garden
33%inclusion1 decks3 decks
-7%synergy
Marsh Flats
33%inclusion1 decks3 decks
28%synergy
Misty Rainforest
33%inclusion1 decks3 decks
27%synergy
Prismatic Vista
33%inclusion1 decks3 decks
29%synergy
Rootbound Crag
33%inclusion1 decks3 decks
-6%synergy
Savannah
33%inclusion1 decks3 decks
22%synergy
Scalding Tarn
33%inclusion1 decks3 decks
29%synergy
Stomping Ground
33%inclusion1 decks3 decks
-11%synergy
Sunpetal Grove
33%inclusion1 decks3 decks
-6%synergy
Temple Garden
33%inclusion1 decks3 decks
-10%synergy
Verdant Catacombs
33%inclusion1 decks3 decks
28%synergy
Boros Garrison
33%inclusion1 decks3 decks
23%synergy
Bountiful Promenade
33%inclusion1 decks3 decks
5%synergy
Gruul Turf
33%inclusion1 decks3 decks
23%synergy
Selesnya Sanctuary
33%inclusion1 decks3 decks
22%synergy
Spectator Seating
33%inclusion1 decks3 decks
8%synergy
Spire Garden
33%inclusion1 decks3 decks
6%synergy
Temple of Abandon
33%inclusion1 decks3 decks
22%synergy
Temple of Plenty
33%inclusion1 decks3 decks
22%synergy
Temple of Triumph
33%inclusion1 decks3 decks
21%synergy
Fortified Village
33%inclusion1 decks3 decks
12%synergy